Danmaku is a free Chrome add-on developed by Chu Zhu. It falls under the category of browsers and specifically belongs to the subcategory of add-ons and tools. This add-on aims to enhance the user experience on Bilibili, a popular video sharing platform.

Danmaku adds a hotness indicator to Bilibili's progress bar, allowing users to easily navigate to the most exciting moments of a video. With this feature, users can quickly jump to the high-energy points of a video, saving them time and providing a more engaging viewing experience.

The add-on is available on the Chrome platform, making it easily accessible to a wide range of users. It is a valuable tool for Bilibili enthusiasts who want to make the most out of their video watching experience.